Standard extensions

[passsy]

Add the standard kotlin extensions

• T.let(block: (T) -> R): R
• T.also(block: (T) -> Unit): T
• T.takeIf(predicate: (T) -> bool): T?
• T.takeUnless(predicate: (T) -> bool): T?

and top-level functions

• TODO() -> Always throws [NotImplementedException] stating that operation is not implemented.
• void repeat(int times, void Function(int) action) Executes the given function [action] specified number of [times].

no run { }?

I explicitly did not add run because

1. I'm very careful with adding top-level functions which might conflict with other packages. run is pretty common and could lead to confusion.
2. Dart supports this construct already

// how run would work
final result = calculation() ?? run(() => 42);
final result = calculation() ?? 
  run(() { 
   return 42
  });

// in pure dart
final result = calculation() ?? (() => 42)();
final result = calculation() ?? 
  () {
    return 42;
  })();

[florent37]

would be useful :)

[codecov]

Codecov Report

Merging #120 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #120   +/-   ##
=======================================
  Coverage   99.61%   99.62%           
=======================================
  Files          38       39    +1     
  Lines        2080     2112   +32     
=======================================
+ Hits         2072     2104   +32     
  Misses          8        8           

Flag	Coverage Δ
#unittests	99.62% <100.00%> (+<0.01%)	⬆️

Impacted Files	Coverage Δ
lib/standard.dart	100.00% <100.00%> (ø)

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